The company I used to work for (Fortune 50 financial) had around half a dozen private jets solely for company use, from Gulfstream V to smaller Bombardier Challenger equipment.
If enough you were travelling to the same place then you could apply for use of one of the private jets. Only the CEO could approve travel on the G-V (as he used it for all his personal and business travels by orders of the board IIRC) but on some of the smaller craft getting authorization was quite straightforward. My first, and only business trip with the company was aboard the private jet fleet.